The theft was discovered on Monday night, when Khloé and her mother Kris were cleaning out the home for the new owners. It came 24 hours after the 29-year-old’s glamorous appearance at Elton John’s AIDS Foundation Oscar-viewing party.

Khloé joined her sisters Kim Kardashian, Kourtney Kardashian, Kourtney’s partner Scott Disick and Kardashian matriarch Kris Jenner for the bash at West Hollywood Park on Sunday.

Khloé was accompanied to the party by her mother Kris and sisters Kim and Kourtney

The brunette looked striking in a burgundy velvet wrap gown, her hair styled into voluminous curls. She vamped up her look with a gothic lipstick.